Means for balancing high-speed commutator-cylinders



C. W. STARKER.

MEANS FOR BALANCING HIGH SPEED COMMUTATOR CYLINDERS.

APPLICATION FILED FEB. 8, I9IB.

wITNI-:ssEs: INvENToR BY M@- UNITED STATES PATENT OFFICE.

CHARLES W. STARKER, OF PITTSBURGH, PENNSYLVANIA, .ASSIGNOR TO WESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVAN IA.

MEANS FOR BALANCING HIGH-SPEED COMMITTATOR-CYLINDERS.

Application filed February 8, 1918.

r o all whom t may concern.'

Be it known that I, CHARLES IV. STARTER, a citizen of the IGrerman Empire, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have in vented a new and useful Improvement in Means for Balancing High-Speed Commutator-Cylinders, of which the following is a specification.

My invention relates to molded commutator cylinders for dynamo-electric machines and it has particular relation to devices of the character designated that are adapted to run at very high speeds.

The object of my invention is to provide a commutator cylinder that shall be easily balanced, simple and compact in construction and inexpensive to manufacture.

Heretofore, it has been customary to balance a molded commutator cylinder by means of a separate annular member mounted on the same shaft with the commutator cylinder. This member is usually so arranged that weight may be added to, or taken away from, any desired portion of its periphery. According to my invention, I provide a device in which the balancing device is integral with the commutator cylin der, making a compact unitary structure.

Referring to the accompanying drawings, Figure l is a longitudinal sectional view of a commutator cylinder constructed in aecordance with my invention; and Fig. 2 is a side elevational view thereof.

Referring more particularly to the draw ings, I have shown a commutator cylinder comprising alternately disposed conducting and insulating sections l and 2, respectively, arranged to form a hollow cylinder, porn tions of which are embedded in molded insulating material 3 that is supported upon a hollow cylindrical sleeve 4, which, in turn,

is mounted upon a shaft 5. The comrnutator cylinder is provided with an annular flanged member 6 at one end thereof which is composed of insulating material and is integral with the main body of insulating material 3. The annular fianged member 6 is provided with openings 7 on the periphery thereof which are corrugated in order to retain weights that are inserted therein to balance the commutator cylinder. The annular ange member 6 is strengthened by an annular bracing member 8, one edge of Specification of Letters Patent.

Patented Dec. 2S, 1920.

serial No. 216,107.

which serves as a reinforcing ring for the commutator' cylinder and t-he other edge of which is provided with fingers 9 that extend between the openings 7' in the annular flange member. Then weights have been inserted in the openings 7 and the commutator is rotated at a high speed, a considerable centrifugal force is exerted upon the flanged member 6, especially along a transverse axis which extends through the centers of the openings 7 so that the portion of the insulating material which lies between the weights is subjected to considerable stress. The purpose of the fingers 9 is to give these intermediate portions added strength in order to withstand the strains exerted thereon by centrifugal force.

lVhile I have shown one form of my invention, it will be obvious to those skilled in the art that it is susceptible of various minor changes and modifications without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or are specifically set forth in the appended claims.

I claim as my invention:

l. In a dynamo-electric machine, a commutator cylinder provided with an annular fiange member at one end thereof composed of insulating material, means for adjusting the weight of any desired portion of said ange, and means for reinforcing the same.

2. In a dynamo-electric machine, a commutator cylinder provided with an annular ange member at one end thereof composed of insulating material and provided with openings therein, and means embedded therein for reinforcing the same.

3. In a dynamo-electric machine, a molded commutator cylinder provided with an annular ange member at one end thereof that is integral with the insulating material in said commutator cylinder and is provided with openings in the periphery thereof, and reinforcing means embedded in said fiange member and provided with fingers extending intermediate said openings.

4. In a dynamo-electric machine, a mold ed commutator cylinder provided with an annular flange member at one end thereof that is integral with the insulating material in said commutator cylinder and is provided in the periphery thereof with openings the CFL walls of which are Corrugated that are adapted to retain weights inserted therein.

5. In l dynamo-elettrie machine, a commutator cylinder' provided with an annular flange member at one end thereof that is integral with the insulating material in said commutator cylinder and is provided with openings in the periphery thereof, and an annular racing member embedded in said annular flange member having fingers extending between the openings therein.

6. A commutator structure comprising a plurality of alternating conducting and insulating sections arranged to form a hollow cylinder and a body of molded insulating` material located within said hollow Cylinder, and an annular flange member at one end thereof that is integral with said molded insulating material and is provided with openings in the periphery thereof, and an annular bracing member embedded in said molded insulating material, one end of which serves as a reinforcing ring for said commutator Cylinder and the other end of which is provided with fingers that extend between the openings in said annular flange member.

7. Ina dynamo-eleetrie machine, a commutator cylinder provided with an annular flange memberat one end thereof, and means for adjusting the disposition of the weight of said flange member.

In testimony whereof l have hereunto sul scribed my name this 2nd day of Feb., 1918 UHARLES XV. STARKEB 

